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<?php |
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|
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// +----------------------------------------------------------------------+ |
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// | Copyright 2013 Madpixels (email : visualizer@madpixels.net) | |
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// +----------------------------------------------------------------------+ |
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// | This program is free software; you can redistribute it and/or modify | |
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// | it under the terms of the GNU General Public License, version 2, as | |
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// | published by the Free Software Foundation. | |
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// | | |
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// | This program is distributed in the hope that it will be useful, | |
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// | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
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// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
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// | GNU General Public License for more details. | |
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// | | |
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// | You should have received a copy of the GNU General Public License | |
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// | along with this program; if not, write to the Free Software | |
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// | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
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// | MA 02110-1301 USA | |
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// +----------------------------------------------------------------------+ |
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// | Author: Eugene Manuilov <eugene@manuilov.org> | |
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// +----------------------------------------------------------------------+ |
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/** |
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* Source manager for JSON URLs. |
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* |
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* @category Visualizer |
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* @package Source |
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* |
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* @since 1.0.0 |
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*/ |
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class Visualizer_Source_Json extends Visualizer_Source { |
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|
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/** |
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* The url to the data. |
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* |
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* @since 1.0.0 |
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* |
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* @access protected |
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* @var string |
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*/ |
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protected $_url; |
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|
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/** |
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* The root to the data. |
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* |
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* @since 1.0.0 |
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* |
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* @access protected |
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* @var string |
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*/ |
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protected $_root; |
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|
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/** |
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* The paging element. |
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* |
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* @since 1.0.0 |
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* |
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* @access protected |
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* @var string |
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*/ |
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protected $_paging; |
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|
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/** |
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* The array that contains the definition of the data. |
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* |
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* @since 1.0.0 |
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* |
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* @access protected |
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* @var array |
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*/ |
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protected $_args; |
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|
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const TAG_SEPARATOR = '>'; |
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const TAG_SEPARATOR_VIEW = ' ➤ '; |
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|
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/** |
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* Constructor. |
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* |
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* @since 1.0.0 |
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* |
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* @access public |
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* @param array $params The array that contains the definition of the data. |
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*/ |
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public function __construct( $params = null ) { |
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$this->_args = $params; |
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if ( isset( $this->_args['url'] ) ) { |
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$this->_url = trim( $this->_args['url'] ); |
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} |
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if ( isset( $this->_args['root'] ) ) { |
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$this->_root = trim( $this->_args['root'] ); |
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} |
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if ( isset( $this->_args['paging'] ) ) { |
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$this->_paging = trim( $this->_args['paging'] ); |
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} |
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|
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Constructor called for params = %s', print_r( $params, true ) ), 'debug', __FILE__, __LINE__ ); |
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} |
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|
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/** |
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* Get the root elements for JSON-endpoint. |
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* |
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* @since ? |
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* |
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* @access public |
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*/ |
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public function fetchRoots() { |
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$roots = apply_filters( 'visualizer_json_get_root_elements', false, $this->_url ); |
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if ( false !== $roots ) { |
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return $roots; |
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} |
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return $this->getRootElements( 'root', '', array(), $this->getJSON() ); |
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} |
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|
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/** |
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* Get the name of the elements that are likely to contain the paginated URLs. |
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* |
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* @since ? |
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* |
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* @access public |
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*/ |
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public function getPaginationElements() { |
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$pages = array(); |
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$root = explode( self::TAG_SEPARATOR, $this->_root ); |
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// the pagination element is usually one level above the root element we are going to use |
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// e.g. if the data is in root > results, the pagination element (let's call it "next") would be root > next and not root > results > next. |
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array_pop( $root ); |
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|
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// base of the next element. |
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$base = implode( self::TAG_SEPARATOR, $root ); |
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// get rid of the first element as that is the faux root element indicator |
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array_shift( $root ); |
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|
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$array = $this->getJSON(); |
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if ( is_null( $array ) ) { |
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return $pages; |
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} |
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|
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$leaf = $array; |
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if ( ! empty( $root ) ) { |
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foreach ( $root as $tag ) { |
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if ( array_key_exists( $tag, $leaf ) ) { |
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$leaf = $array[ $tag ]; |
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} else { |
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// if the tag does not exist, we assume it is present in the 0th element of the current array. |
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$leaf = $leaf[0][ $tag ]; |
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} |
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} |
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} |
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|
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$paging = array(); |
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foreach ( $leaf as $key => $value ) { |
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// the paging element's value will most probably contain the url of the feed. |
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if ( is_string( $value ) && 0 === stripos( $value, $this->_url ) ) { |
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$paging[] = $key; |
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} |
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} |
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|
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foreach ( array_filter( array_unique( $paging ) ) as $page ) { |
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$pages[] = $base . self::TAG_SEPARATOR . $page; |
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} |
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return $pages; |
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} |
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|
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/** |
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* Parse the JSON-endpoint from the chosen root as the base. |
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* |
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* @since ? |
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* |
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* @access public |
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*/ |
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public function parse() { |
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$url = $this->_url; |
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$data = array(); |
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$page = 1; |
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|
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while ( ! is_null( $url ) && $page++ < apply_filters( 'visualizer_json_fetch_pages', 5, $this->_url ) ) { |
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$array = $this->getJSON( $url ); |
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if ( is_null( $array ) ) { |
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return $data; |
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} |
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|
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$root = explode( self::TAG_SEPARATOR, $this->_root ); |
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// get rid of the first element as that is the faux root element indicator |
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array_shift( $root ); |
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$leaf = $array; |
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foreach ( $root as $tag ) { |
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if ( array_key_exists( $tag, $leaf ) ) { |
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$leaf = $leaf[ $tag ]; |
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} else { |
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// if the tag does not exist, we assume it is present in the 0th element of the current array. |
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// TODO: we may want to change this to a filter later. |
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$leaf = $leaf[0][ $tag ]; |
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} |
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} |
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|
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// now that we have got the final array we need to operate on, we will use this as the collection of series. |
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// lets check if the series is a flat-series e.g. https://api.exchangeratesapi.io/latest |
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// in this, all values of `$leaf` would be a string, not an array. |
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$values = array_values( $leaf ); |
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if ( ! is_array( $values[0] ) ) { |
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Looks like a flat-series = %s', print_r( $leaf, true ) ), 'debug', __FILE__, __LINE__ ); |
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$inner_data = array(); |
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foreach ( $leaf as $datum => $value ) { |
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$inner_data[ $datum ] = $value; |
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} |
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$data[] = $inner_data; |
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} else { |
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// we will filter out all elements of this array that have array as a value. |
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foreach ( $leaf as $datum ) { |
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$inner_data = array(); |
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foreach ( $datum as $key => $value ) { |
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if ( is_array( $value ) ) { |
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continue; |
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} |
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$inner_data[ $key ] = $value; |
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} |
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// if we want to exclude entire rows on the basis of some data/key. |
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if ( apply_filters( 'visualizer_json_include_row', true, $inner_data, $this->_root, $this->_url ) ) { |
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$data[] = $inner_data; |
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} |
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} |
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} |
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|
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$url = $this->getNextPage( $array ); |
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} |
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|
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Parsed data endpoint %s with rooot %s is %s = ', $this->_url, $this->_root, print_r( $data, true ) ), 'debug', __FILE__, __LINE__ ); |
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|
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return $data; |
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} |
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|
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/** |
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* Get the next page URL. |
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* |
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* @since ? |
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* |
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* @access private |
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*/ |
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private function getNextPage( $array ) { |
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if ( empty( $this->_paging ) ) { |
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return null; |
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} |
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|
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$root = explode( self::TAG_SEPARATOR, $this->_paging ); |
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// get rid of the first element as that is the faux root element indicator |
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array_shift( $root ); |
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$leaf = $array; |
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foreach ( $root as $tag ) { |
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if ( array_key_exists( $tag, $leaf ) ) { |
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$leaf = $array[ $tag ]; |
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} else { |
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// if the tag does not exist, we assume it is present in the 0th element of the current array. |
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// TODO: we may want to change this to a filter later. |
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$leaf = $leaf[0][ $tag ]; |
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} |
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} |
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|
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Got next page as %s for paging element %s', $leaf, $this->_paging ), 'debug', __FILE__, __LINE__ ); |
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|
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return $leaf; |
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} |
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|
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/** |
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* Get the root elements for JSON-endpoint. |
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* |
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* @since ? |
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* |
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* @access private |
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*/ |
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private function getRootElements( $parent, $now, $root, $array ) { |
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if ( is_null( $array ) ) { |
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return array(); |
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} |
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|
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foreach ( $array as $key => $value ) { |
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if ( is_array( $value ) && ! empty( $value ) ) { |
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if ( ! is_numeric( $key ) ) { |
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$now = sprintf( '%s%s%s', $parent, self::TAG_SEPARATOR, $key ); |
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$root[] = $now; |
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} else { |
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$now = $parent; |
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} |
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$root = $this->getRootElements( $now, $key, $root, $value ); |
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} |
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} |
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$roots = array_filter( array_unique( $root ) ); |
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Roots found for %s = ', $this->_url, print_r( $roots, true ) ), 'debug', __FILE__, __LINE__ ); |
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return $roots; |
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} |
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|
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/** |
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* Get the JSON for the JSON-endpoint. |
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* |
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* @since ? |
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* |
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* @access private |
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*/ |
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private function getJSON( $url = null ) { |
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if ( is_null( $url ) ) { |
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$url = $this->_url; |
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} |
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// allow hooks to use any other args such as method=POST. |
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$response = wp_remote_request( $url, apply_filters( 'visualizer_json_args', array( 'method' => 'GET' ), $url ) ); |
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if ( is_wp_error( $response ) ) { |
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Error while fetching JSON endpoint %s = ', $url, print_r( $response, true ) ), 'error', __FILE__, __LINE__ ); |
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return null; |
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} |
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|
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$array = json_decode( wp_remote_retrieve_body( $response ), true ); |
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|
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'JSON array for the endpoint is %s = ', print_r( $array, true ) ), 'debug', __FILE__, __LINE__ ); |
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|
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return $array; |
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} |
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|
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|
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/** |
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* Fetches series information. This is fetched only through the UI and not while refreshing the chart data. |
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* |
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* @since 1.0.0 |
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* |
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* @access private |
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*/ |
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private function _fetchSeries() { |
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$params = $this->_args; |
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$headers = array_filter( $params['header'] ); |
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$types = array_filter( $params['type'] ); |
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$header_row = $type_row = array(); |
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if ( $headers ) { |
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foreach ( $headers as $header ) { |
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if ( ! empty( $types[ $header ] ) ) { |
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$this->_series[] = array( |
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'label' => $header, |
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'type' => $types[ $header ], |
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); |
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} |
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} |
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} |
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|
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Series found for %s = ', $this->_url, print_r( $this->_series, true ) ), 'debug', __FILE__, __LINE__ ); |
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|
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return true; |
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} |
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|
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/** |
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* Fetches data information. |
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* |
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* @since 1.0.0 |
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* |
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* @access private |
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*/ |
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private function _fetchData() { |
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$params = $this->_args; |
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|
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$headers = wp_list_pluck( $this->_series, 'label' ); |
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$data = $this->parse(); |
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foreach ( $data as $line ) { |
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$data_row = array(); |
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foreach ( $line as $header => $value ) { |
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if ( in_array( $header, $headers, true ) ) { |
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$data_row[] = $value; |
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} |
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} |
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$this->_data[] = $this->_normalizeData( $data_row ); |
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} |
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|
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do_action( 'themeisle_log_event', Visualizer_Plugin::NAME, sprintf( 'Data found for %s = ', $this->_url, print_r( $this->_data, true ) ), 'debug', __FILE__, __LINE__ ); |
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|
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return true; |
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} |
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|
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/** |
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* Fetches information from source, parses it and builds series and data arrays. |
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* |
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* @since 1.0.0 |
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* |
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* @access public |
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* @return boolean TRUE on success, otherwise FALSE. |
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*/ |
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public function fetch() { |
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$this->_fetchSeries(); |
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$this->_fetchData(); |
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return true; |
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} |
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|
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/** |
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* Refresh the data for the provided series. |
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* |
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* @since ? |
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* |
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* @access public |
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*/ |
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public function refresh( $series ) { |
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$this->_series = $series; |
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$this->_fetchData(); |
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return true; |
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} |
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|
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/** |
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* Returns source name. |
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* |
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* @since 1.0.0 |
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* |
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* @access public |
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* @return string The name of source. |
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*/ |
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public function getSourceName() { |
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return __CLASS__; |
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} |
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|
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} |
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|
